To mimic bacterial light-harvesting antenna complexes, a series of dendritic multiporphyrin arrays, nPZn-PFB (n = 2, 4; cone-shaped dendrimers, n = 8, 16; star-shaped dendrimers), were synthesized and characterized by 1H NMR and MALDI-TOF-MS spectroscopy. Photoinduced energy-transfer efficiency (ΦET) from peripheral Zn porphyrin (PZn) units to an inner core free-base porphyrin (PFB) in the dendrimers was evaluated by fluorescence measurement. Both star- and cone-shaped multi-porphyrin arrays exhibited significantly high efficiency energy transfer from the photoexcited PZn units to the energy-accepting PFB, where the star-shaped dendrimers, 8P Zn-PFB (94%) and 16PZn-PFB (88%), had a slightly higher efficiency than those of the cone-shaped dendrimers, 2PZn-PFB (92%) and 4PZn-PFB (80%), respectively.
Bibliographical noteFunding Information:
This research was supported by a grant from Korea Research Foundation (KRF-2007-313-D00225) and the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea. C.-H. Lee acknowledges a fellowship from the BK21 program from the Ministry of Education, Science and Technology.
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